Subtract 81/20 from 42/70
1st number: 42/70, 2nd number: 4 1/20
42/70 - 81/20 is -69/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
42/70 = 42 × 2/70 × 2 = 84/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
81/20 = 81 × 7/20 × 7 = 567/140 - Subtract the two like fractions:
84/140 - 567/140 = 84 - 567/140 = -483/140 - After reducing the fraction, the answer is -69/20
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